Infrared praticle 2

Question 1

What is this used for?

Answer 1

Measure the absorbance of infrared by different surfaces.

Question 2

Method:

Answer 2

Equipment:

• Infrared heater~ Either sides are 2 metal plates.
• 1 Plate= Painted with shiny metallic paint.
• 2nd plate= Painted with matt black paint.

Other sides of the plates:
- Vaseline is used to attach a drawing pin.

1) Start on the heater and start timing.
2) The temperature of the metal plates= increases as they abosrb infrared.

Question 3

What do we record?

Answer 3

• The time it takes for the vassaline to melt and the drawing pins to fall off.

Question 4

Results:

Answer 4

• Drawing pin falls of the matt black paint first.
• Matt black surfaces abosrn more infrared than shiny metallic substances.

Matt Black surfaces= much better at emmiting and absorbing infrared than shiny metallic substances.

Infrared tents to reflect from shiny metallic surfaces instead,